These data files contain 12-min resolution solar wind
proton flow velocity (GSE, RTN and GSM components), scalar speed, density,
and (radial component of) temperature, plus the alpha particle to proton
density ratio. The data are typically from the SWEPAM instrument. But
because SWEPAM has reduced sensitivity at the lowest energies, and at
times underestimates the proton density, especially for very slow wind,
proton density is sometimes culled from low-speed (.LT. ~350 km/s)
intervals in the SWEPAM Level 2 data, and proton temperature may also
be culled. More rarely, the solar wind velocity may also be culled,
especially during periods of both high solar energetic particle
background and high wind speeds. In these cases, SWICS-determined
proton density and temperature, and possibly also flow speed (not
velocity vectors), are included in the data records, with a flag to
indicate whether, and which, SWICS parameters are in the records.
As of July, 2012, data were available to the end of 2009.

The SWICS 2.0 dataset consists of time series measurements by ACE/SWICS of the elemental abundance, charge state composition, and kinetic distribution of heavy ions in the solar wind. This data set begins after August 23, 2011, when a radiation and age-induced hardware anomaly altered the instrument's operational state. It should not be confused with SWICS 1.1, the recalibrated data set extending from launch up to the anomaly.
SWICS 2.0 continues to make heavy ion measurements which are not available from any other instrument, and new data analysis methods have been developed to address the statistical and calibration issues of the current instrument state.

The data are 19.2-s count rates of electrons and protons at several energy steps between 40 eV and 20 keV. Two electrostatic analyzers, each feeding 6 detectors, are oriented vertical from the lunar surface and 60 degrees from vertical, towards lunar west.

Two Dynamics Explorer (DE) spacecraft were launched August 3, 1981, and placed
into coplanar polar orbits with DE-1 in a highly elliptical orbit and DE-2
in a lower more circular orbit. The primary objective of the DE program was
to investigate magnetosphere-ionosphere-atmosphere coupling processes.
The DE mission provided a wealth of new information on a wide variety of magnetospheric
plasma wave phenomena including auroral kilometric radiation, auroral hiss,
Z mode radiation, narrow-band electromagnetic emissions associated with equatorial
upper hybrid waves, whistler mode emissions, wave-particle interactions stimulated
by ground VLF transmitters, equatorial ion cyclotron emissions, ion Bernstein
mode emissions, and electric field turbulence along the auroral field lines.
These files contain calibrated, full resolution, data from the DE-1 Plasma Wave
Instrument (PWI). This instrument was designed and built by the plasma wave
group at The University of Iowa, Department of Physics and Astronomy, in collaboration
with investigators at Stanford University's STAR Laboratory. It measured plasma
wave phenomena and quasi-static electric fields using paired combinations of
five PWI sensors: a 200m tip-to-tip long wire electric antenna deployed in the spacecraft
spin plane, a 9m tip-to-tip tubular electric antenna deployed along the spacecraft spin
axis, a short 0.6m electric antenna, mounted on the boom and oriented parallel
to the long wire antenna, a magnetic loop antenna mounted on the boom and oriented
to measure the component of the magnetic field parallel to the long wire antenna,
and a magnetic search coil antenna, also mounted on a boom and oriented to
measure the magnetic field parallel to the spacecraft spin axis.
The PWI main electronics unit consisted of a Step Frequency Correlator (SFC),
a Low Frequency Correlator (LFC), a Wideband Analog Receiver (WBR) and a Linear
Wave Receiver (LWR). Only the LFC data are included in these files. The SFC
data were provided in a companion fileset. A dataset containing available high
rate WBR LWR data may be provided in future archive products.
The LFC consisted of two receivers (LFR-A and LFR-B) with 8 analog channels
each. The analog channels were centered at 1.78, 3.12, 5.62, 10.0, 17.8, 31.2,
56.2 and 100 Hz. Each channel's band-edge was at +/-15% of the center value.
Each LFR in the LFC could be connected to either the Ex, Es, Ez, or H antenna
during an 8 second major frame. In addition, the Low Frequency Correlator
provided in-phase and quadrature-phase correlations of signals from any selected
antenna pair. Phase data are not provided in this file set.

This dataset contains dynamic spectrogram PNG plots of the DE-1/PWI Step Frequency Correlator and Low Frequency Correlator data. Each plot spans one orbital period (6 hours 49 minutes). There are three types of files in this dataset. Those derived from data using: 1) the spin-plane 200m electric antenna (Ex), 2) the spin-axis 8m electric antenna (Ez) and 3) the magnetic antennas (B-H) consisting of a 1.0m^2 loop antenna in the spin plane and a search coil on the spin axis.
Each image consists of two panels. The title above each panel indicates the instrument, antenna and frequency range. Each panel is a plot of the power spectral density of received signal (color scale) as a function of operating frequency (in a logarithmic scale on the vertical axis) and time (horizontal axis). Beneath the time labels on the horizontal axis of the spectrograms are ephemeris data: position of the spacecraft in radial distance (Earth radii), McIlwain L-shell, magnetic local time, and geomagnetic latitude. Overlaid on each image are traces of the electron cyclotron frequencies.
The file naming convention is:
de1_pwi_0000_YYYYMMDD_HHMM_AAA.png
where: 0000 - Replace with orbit number
YYYYMMDD - Replace with date
HHMM - Replace with start time
AAA - Replace with antenna string

Two Dynamics Explorer (DE) spacecraft were launched August 3, 1981, and placed
into coplanar polar orbits with DE-1 in a highly elliptical orbit and DE-2
in a lower more circular orbit. The primary objective of the DE program was
to investigate magnetosphere-ionosphere-atmosphere coupling processes.
The DE mission provided a wealth of new information on a wide variety of magnetospheric
plasma wave phenomena including auroral kilometric radiation, auroral hiss,
Z mode radiation, narrow-band electromagnetic emissions associated with equatorial
upper hybrid waves, whistler mode emissions, wave-particle interactions stimulated
by ground VLF transmitters, equatorial ion cyclotron emissions, ion Bernstein
mode emissions, and electric field turbulence along the auroral field lines.
These files contain calibrated, full resolution, data from the DE-1 Plasma Wave
Instrument (PWI). This instrument was designed and built by the plasma wave
group at The University of Iowa, Department of Physics and Astronomy, in collaboration
with investigators at Stanford University's STAR Laboratory. It measured plasma
wave phenomena and quasi-static electric fields using paired combinations of
five PWI sensors: a 200m tip-to-tip long wire electric antenna deployed in the spacecraft
spin plane, a 9m tip-to-tip tubular electric antenna deployed along the spacecraft spin
axis, a short 0.6m electric antenna, mounted on the boom and oriented parallel
to the long wire antenna, a magnetic loop antenna mounted on the boom and oriented
to measure the component of the magnetic field parallel to the long wire antenna,
and a magnetic search coil antenna, also mounted on a boom and oriented to
measure the magnetic field parallel to the spacecraft spin axis.
The PWI main electronics unit consisted of a Step Frequency Correlator (SFC),
a Low Frequency Correlator (LFC), a Wideband Analog Receiver (WBR) and a Linear
Wave Receiver (LWR). Only the SFC data are included in these files. The LFC
data were provided in a companion fileset. A dataset containing available high
rate WBR LWR data may be provided in the future.
The SFC consisted of two Step Frequency Receivers (SFR-A and SFR-B) which provided
amplitude measurements of the electric and magnetic fields from 100 Hz to 400 kHz
and in-phase and quadrature-phase correlations of signals from any selected antenna pair.
Phase data are not provided in these datasets.

This dataset contains two hour duration dynamic spectrogram GIF plots of the DE-1/PWI SFR-A (electric antenna).
Each image is a plot of the power spectral density (V^2 m^-2 Hz^-1) of received signal (color scale) as a function of operating frequency (in a logarithmic scale on the vertical axis) and time (horizontal axis). At the top center of each plot is a title indicating the University of Iowa, the instrument, and the date. On the upper left is an indication of the receiver used, the upper right is the orbit number. Immediately below the title is a horizontal bar and the label "WB" on the extreme left indicating the time duration when wideband data were acquired. Beneath the time labels on the horizontal axis of the spectrogram are ephemeris data: position of the spacecraft in radial distance (Earth radii), McIlwain L-shell, magnetic local time, and geomagnetic latitude. Overlaid on each image are traces of the electron, hydrogen and oxygen cyclotron frequencies. Running along the left edge of the plot next to the frequency scale is the date represented as two digit year, day of year, hour and minute of the start of the plot.

This set of IMP 6 LANL 1-hr solar wind plasma parameter data includes temperature anisotropy and alpha/proton ratio. This hourly resolution data set was created at NSSDC in the year 2003 by averaging 2-min resolution solar wind data provided over the years by LANL. Magnetosheath data were excluded from the 2-min data by LANL. This data set supersedes hourly solar wind data provided by LANL over the years.

This set of IMP 7 LANL 1-hour solar wind plasma parameter data includes temperature anisotropy and alpha/proton ratio. This hourly resolution data set was created at NSSDC in the year 2003 by averaging 2-min resolution solar wind data provided over the years by LANL. Magnetosheath data were excluded from the 2-min data by LANL. This data set supersedes hourly solar wind data provided by LANL over the years.

This quick-look data pool data set contains selected physical parameters computed centrally for each instrument at resolutions between one and five minutes, using quick-look, PI-provided algorithms. It was created in binary IBM 360 representation with unblocked, 3240-byte records. The first record of each file is a data pool file label containing satellite ID number; year, day of year, and seconds of day for the start and end of file; spacecraft clock; telemetry group number; minimum and maximum value of spin period found in this file; shadow times; and bit rate. The label record is followed by a number of data records containing day of year and seconds of day; s/c clock; bit rate; housekeeping and engineering items; spin period average; satellite position vector in GSE coordinates; and outputs of the investigators' quick-look data-processing algorithms for selected parameters from ten of the onboard experiments. The fast plasma data (Gosling/LANL) include four-level electron spectra, ion pseudondensities, average energies, and solar wind peak speeds and pseudodensities, at 5-minute resolution. The hot plasma (Frank, U. Iowa) algorithm outputs include proton densities, 10 keV electron fluxes, and energy range indicators, at 5-minute resolution. The fluxgate magnetometer data (Russell, UCLA) include 25 hourly parameters, plus the components of the magnetic field in spacecraft coordinates, at 1-minute resolution. The low-energy cosmic ray data (Hovestadt, MPI) include count rates of protons in three energy intervals between 0.17 and 20 MeV, plus those of alpha particles from 0.12 to 0.25 MeV and of Z>2 particles above 0.1 MeV, at 15-second resolution. The quasi-static electric field (Mozer, UCB) algorithm outputs indicate whether the experiment's electron guns were on or off during each 64-second interval. The plasma wave data (Gurnett, U. Iowa) include instantaneous samples from the 562 Hz filter channels of the electron and magnetic spectrum analysers, at 5-minute resolution. The plasma density data (Harvey, CESR) include indicators of the activity of the sounder and the propagation transmitters during each 64-second period. The energetic electron and proton algorithm outputs (Williams, APL) include both electron and proton differential fluxes in the 32 to 50 keV and the 80 to 126 keV energy ranges. These fluxes are taken in or near the spin-normal (nominally ecliptic) plane, at 5-minute resolution. The electron and proton experiment (K.Anderson, UCB) algorithm outputs include both electron and proton fluxes in the energy range 8 to 200 keV, at 5-minute resolution. The ion composition data (Sharp, Lockheed) include the cold plasma density and flags indicating the presence of high ion temperatures and bulk flow in the plasma, at 5-minute resolution. The Pool Tape Documentation (GSFC document X-692-77-129) (B29494 in NSSDC's Publications database) includes brief descriptions of the instruments, sometimes quite detailed, and also descriptions of the quick-look algorithms, also sometimes quite detailed.

This data set consists of three-dimensional proton and electron distribution functions. The energy range is 1 eV to 45 keV or 215 eV to 45 keV, according to mode. Time resolution for full distributions is 128 sec or 512 sec, depending on telemetry bit rate. Eight latitude and 16 azimuth bins are used, spanning 180 deg and 360 deg. Spacecraft position information is included. Data are currently in VAX binary format. Data are for discrete intervals 11/01/1977-12/31/1980, 10/15/1982-12/27/1983, 03/01/1986-06/01/1986

This data set consists of a set of daily files
with GIF-formatted spectrograms displaying color coded ion flux levels
as functions of time and of energy level, in each of 4 look-direction
quadrants, over the energy range of ~150 eV/q to 45 keV/q. Also
displayed is a single omni-directional spectrogram for electrons
in the same energy range. ISEE position data is listed once every
every four hours across the time axis.

This data set, held in CDAWeb as ISEE1_H0_FE,
contains electron moments from the Vector Electron Spectrometer
(VES), and spacecraft position vectors, at 9s or 18s resolution,
depending on spacecraft telemetry rate. The data set
also holds 1-min averages of the measured magnetic field
vector. Electron moments include density, flow velocity,
temperature and its anisotropy, and heat flux vector. Also given
are the pressure tensor, its diagonalizing eigenvector, and the
angle between its principal axis and the ambient magnetic field
vector. These parameters are based on distributions accumulated
in 3 sec but telemetered over 9s or 18s. Ancillary information
given includes the spacecraft spin period, the spacecraft
potential, the energy channels above this potential on which the
moments for this record were based, and on/off flags for the
Harvey and Mozer experiments.